(5a+3b-2)(5b-3b+2)计算

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/15 22:43:00
(5a+3b-2)(5b-3b+2)计算(5a+3b-2)(5b-3b+2)计算(5a+3b-2)(5b-3b+2)计算原式=[5a+(3b-2)][5a-(3b-2)]=(5a)²-(3b

(5a+3b-2)(5b-3b+2)计算
(5a+3b-2)(5b-3b+2)计算

(5a+3b-2)(5b-3b+2)计算
原式
=[5a+(3b-2)][5a-(3b-2)]
=(5a)²-(3b-2)²
=25a²-(9b²-12b+4)
=25a²-9b²+12b-4

(5a+3b-2)(5b-3b+2)
=(5a+3b)²-4
=25a²+30ab+9b²-4
祝学习进步,望采纳,不懂的欢迎追问。。。

应该打错了吧?后面括号里的5b应该是5a?
(5a+3b-2)(5a-3b+2)=[5a+(3b-2)][5a-(3b-2)]=(5a)²-(3b-2)²=25a²-9b²+12b-4
注意利用公式(a-b)(a+b)=a²-b² 及 (a-b)²=a²-2ab+b²来计算哦
不懂就追问哈~

第二个应该是5a-3b+2吧